Keep your costs down. In order to turn a profit on what you're selling, choose to sell an item that's inexpensive to make. Lemonade is a classic because all of its ingredients (water, sugar, lemons or lemon juice concentrate, and ice) are fairly cheap and easy to obtain. Popsicles are another favorite because they can be bought in large quantities from the store!
Parlay your math, science, foreign-language or test-prep expertise into a lucrative side gig by becoming a private tutor. You can tutor people online or in-person. What you charge can depend on your experience, expertise and what’s in demand. To get started, see what types of tutors are needed on Craigslist, or create a profile on sites like Tutor.com or Care.com. You can also advertise your services at local schools and community centers.
If there’s a plasma donation center in your area, you might be able to make anywhere from $25 to $50, and odds are, you’ll get paid today. Call ahead and ask, of course, but these days, many donation centers are giving money cards (similar to a debit card). Generally, it takes about 30 minutes to donate your plasma, but a first visit may take longer — up to two hours — since you’ll be filling out paperwork and taking a physical. And while it’s not a ton of money, many donors are able to sell plasma twice a week.
28. Subscription – If you think of something valuable (newsletter, online magazine, etc.) that you can consistently offer on a certain basis (weekly, monthly, etc.), you may want to offer a subscription service. This could be a fee charged each time your product is sent out or on a monthly basis. Either way, this has to be something that your customers can only get by subscribing to your website.
If you have a blog or some other online property with some traffic, you can monetize it via affiliate advertising. For example, imagine that you write a blog about cars and you have thousands of visitors each month. You might review some books or products related to cars, and then link to them on Amazon so that you get a cut of the purchase price when anyone buys books through the links.
ebay is a popular resource for selling various used and unwanted items. However, there are specific sites for selling certain used items such as books, jewelry, wedding dresses, and electronics where you may have greater success. Also, to maximize earnings, it's important to take a great photo of the item and write a compelling, honest description.
Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).
If you have an old smartphone and you need money today, check out ecoATM. Type in your ZIP code, and with any luck, you’ll find one of their ATMs in your area. If you do, you simply find the kiosk and place the old cell phone in the ecoATM’s test station, where the machine will examine your phone — noting the model number and condition, among other features. It then automatically scans the resale market for similar phones and offers you a price based on its value — if you agree to the price, you’ll get the money on the spot (hence the ATM in the name). They also accept MP3 players and tablets.
Babysitting isn’t just for teens. Everyone from college students to recent retirees can make money watching other people’s children. Word-of-mouth referrals from friends and family are still a great way to get started, but you can also create a profile on Care.com or Sittercity to expand your reach. Note any specialized skills, such as CPR certifications or experience with special needs children, to make yourself more marketable.

Websites like Survey Junkie will pay you a decent chunk of change for the low-maintenance, borderline mindless task of completing surveys. Companies want to understand consumers better, and one way they do that is by compensating survey-takers (a.k.a. you). Most surveys pay between $0.50 and $1.25, and many of them take less than 5 minutes to do. You can read our full Survey Junkie review for more info.
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